Finding the Fourth Proportional to 2,390.24, 3,298.65 and 1,328.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.24 : 3,298.65 = 1,328.12 : x
2. Step 2: Convert to fraction form
   2,390.24/3,298.65 = 1,328.12/x
3. Step 3: Cross multiply
   2,390.24x = 3,298.65 × 1,328.12
4. Step 4: Simplify right side
   2,390.24x = 4,381,003.04
5. Step 5: Solve for x
   x = 4,381,003.04/2,390.24
6. Step 6: Final answer
   x = 1,832.87